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Deuterium dilution as a method for determining total body water: effect of test protocol and sampling time

Published online by Cambridge University Press:  09 March 2007

Wouter D. Van Marken Lichtenbelt ,
Klaas R. Westerterp  and
Loek Wouters
Wouter D. Van Marken Lichtenbelt
Affiliation:
Department of Human Biology, University of Limburg, PO Box 616, 6200 MD Maastricht, The Netherlands
Klaas R. Westerterp
Affiliation:
Department of Human Biology, University of Limburg, PO Box 616, 6200 MD Maastricht, The Netherlands
Loek Wouters
Affiliation:
Department of Human Biology, University of Limburg, PO Box 616, 6200 MD Maastricht, The Netherlands
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Abstract

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Deuterium dilution for the measurement of total body water (TBW) has been conducted using varying protocols for equilibration. We measured TBW from deuterium dilution in urine samples in twenty-eight subjects using three protocols: (1) early morning dosage without breakfast, measuring deuterium in a second voiding at 4h and 6h; (2) early morning dosage with breakfast with the same measurement times; (3) dosage as last consumption before overnight sleep, measuring deuterium in a second voiding at 10 h. Results were compared with TBW estimates from underwater weighing (UWW). Because UWW is an indirect measure of TBW, it is used as an independent reference method in order to compare only relative discrepancies between the two methods. TBW values in the fasted state were not significantly different from those obtained in the fed state. The urinary deuterium enrichment was higher at 4 h than at 6 h (resulting TBW differences: 0·6 (SD 0·4)I). At 4h and 6h, differences in TBW measurements from deuterium and densitometry were positively related to the amount of TBW, indicating incomplete equilibration in larger water compartments. At 10h no such relationship existed, indicating complete mixing of deuterium. It is concluded that 10h equilibration is preferable to the shorter 4h and 6h, for the determination of TBW.

Keywords

Deuterium dilutionTotal body waterUnderwater weighing
Type
Measurement of body Composition
Information
British Journal of Nutrition , Volume 72 , Issue 4 , October 1994 , pp. 491 - 497
Copyright
Copyright © The Nutrition Society 1994

References

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